Boiler furnace



J. VAN BRU NT BOILER FURNACE Nov. 5, 1929.

Filed Dec. 8, 1925 2 Sheets-Sheet MM =2- WWW ATTORNEY/5 Nov. 5, 1929.

J. VAN BRUNT BOILER FURNACE Filed Dec. 8, I 1925 2 Sheets-Sheet 2 INVENTOR v A TTORNEl s Patented Nov. 5, 122% saunas snares arena castes JOHN VAN BRUNEI, OF FLUSHING, NEW YORK, ASSIGNOR TO INTERNATIONAL COM- BUSTION ENGINEERING CORPORATION,

DELAWARE OF NEW YOBK, N, 2., A CORPORATION Fv norms. FURNACE Application filed. December 8, 1925. Serial No. 73,970.

The foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, are realized by means of a construction which I have illustrated in the preferred form, in'which- Fig. 1 is a vertical section through a boiler furnace embodying my improvements.

Fig. 2 is a fragmentary .vertical section.

taken on the line 2-2 of Fig. 1 drawn on an enlarged scale to more clearly illustrate details of the invention, and

Fig. 3 is a section taken on the line 33 of Fig. 2 looking in the direction of the arrows. Referring now to Fig. .1, the reference character A denotes the combustion chamber having an outlet 7 in its upper part for the waste products of combustion, over which outlet is arranged the boiler elements 8. The pulverized coal is admitted into the combustion chamber through the arch 9 by means of a row. of burners 10, the fuel descending downwardly until the momentum of the fuel .and flame stream is overcome, whereupon the fuel and flame stream ascends, the course taken by the fuel and, flame stream thus describing a U.' Preferably that portion of the combustion chamber into which the fuel is admitted by the burners has its refractories exposed, whereby the entering fuel is subjected to radiant heat therefrom. The remaining portions of the upright walls of the combustion chamber are provided with the side water walls B, and the rear water wall C. The side water walls are composed of a pluralityof upright tubes 11, each of which, on opposite sides, is provided with longitudinally extending fins 12, the fins and tubes temperature.

cooperating to form a substantially continuous metallic wall. The lower ends of the tubes 11 pass outwardly through the side walls of the combustion chamber for eonnection into the headers 13, and the upper ends of the tubes 11 pass out similarly for connection intothe headers 14. The headers 13 are supplied with Water by a downcomer means 15 and upcomer means 16 lead from headers 14 to the drum 17 of the boiler.

' The rear water Wall C is composed of similar tubes 11 providedwith similar fins 12 The upperends of the tubes 11 connect into the header 18 which has the upoomers 19 leading from opposite sides thereof to the drum 1'1 Each pair of the. tubes 11 have their lower ends connected into the junction blocks 20.

.The lower portion of the combustion space i immediately above theash pit 21 is provided with a water screen composed of a plurality of spaced tubes 22, the rear ends of which are connected into the junction blocks 20. The w front ends of the tubes 22 are connected into the header 23 which is supplied with'water by the downcomer means 15.

Ordinarily no difiiculty is encountered in connection with the circulation through the rear water wall. However, in installations of 'wards. and at still other times is violently downwards.

To overcome this condition, I connect the headers 14 with the headers 13 by a plurality of tubes 24 located extcriorly of the setting. These tubes being located exteriorly, and, therefore, remote from the source of heat, ensure that the circulation through the upright water walls will always be in an upward direction. The importance of securing proper circulation through the tubes of the side water walls will be realized, when it is considered that. such tubes are subjected to radiant heat coming opposite the zone of highest Such being the case, these tubes will burn out if the circulation therethrough is not rapid and continuous By my improved arrangement I find that I overcome .the difliculties and ensure proper circulation.

It will be noted that the spacing of the tubes 24 varies, the spacing being closest toward the lower ends of the headers 13 and 14 I for the reason that that portion of the water wall served by these portions of the headers is opposite the zone of highest temperature.

The number, and therefore the total capacity, of the tubes 24 is less than that of the .tubes 11 in the screen B. This arrangement will prevent an independent circulation of all of the water in the screen B, and will ensure that part of the water in the screen is always in the general boiler circulation.

What I claim is In combination, a boiler, a combustion chamber, a plurality of upright tubes defining a portion of the combustion space, a header into which the upperends of said tubes are connected, a header ihto which the lower ends of said tubes are connected, down- 25 comer means connecting said lower he'ader with the boiler, upcomermeans connecting 'said upper header with the boiler, and other tubes outside the combustion chamber di-- rectly connecting said headers together, said latter tubes being spaced more closely adjacent the region in which the first mentioned Epright tubes are subjected to the greatest eat.

In testimony whereof I have hereunto signed my name.

, JOHN VAN BRUNT. 

